Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc90ed9247064df9…

MALICIOUS

PDF

42.4 KB Created: 2020-08-05 01:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f23f158f67ddbf9217aea85da26b6886 SHA-1: a122451b0e30081c48978ac72cb8913f40d434d8 SHA-256: cc90ed9247064df9fd6f8d348b07187699f4d9abb4c60cf05721cfa7165483dd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, https://ttraff.ru/pify?keyword=energia+hidraulica+libros+pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and appears to be a mix of metadata and garbled text, but the presence of the malicious redirector and the link farm strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=energia+hidraulica+libros+pdf
    • http://files.hisonelife.com/uploads/1/3/2/7/132712206/605500e61cb9.pdf
    • http://files.civility-project.com/uploads/1/3/1/3/131384432/dc4fc.pdf
    • http://files.ilovetheglassonion.com/uploads/1/3/0/7/130776485/fesun-wowukoxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/divesejugivutumuwoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2677/5196/files/dojowinajafaxubowojanore.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/losube.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/16664771943.pdf
    • https://cdn.shopify.com/s/files/1/0428/8384/2215/files/convert_color_to_black_and_white.pdf
    • https://cdn.shopify.com/s/files/1/0430/1481/5901/files/kutukateregofetagidokeze.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/kidavubekesupitelugapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6372/9557/files/numusazisisokakupuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6930/files/lavomakis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5694/files/lobegivuzorojogifijifor.pdf
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/23760531869.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/venuvalumotupuwewum.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/vajojewos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006363.bin
8bc8df6988247262dd5357f4fc436bc1aa0c7767ebcb966bd8a8dc39a63b5e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6363 5512 bytes
font_01_sfnt_off00007615.bin
af9e92bae0a999ce261ec846a43ea6935327dce88732757d27dcc0c76515af9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7615 11468 bytes

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